CN220456224U - Coil structure, generator transformer and power generation boosting system - Google Patents

Abstract

The application relates to a coil structure, a generator transformer and a power generation boosting system. The coil structure comprises a main column, a first high-voltage coil, a first low-voltage coil, a second low-voltage coil and a second high-voltage coil are sequentially arranged on the main column from inside to outside, the capacity and the voltage level of the first low-voltage coil and the second low-voltage coil are different, and generator sets with different capacities and different voltage levels are respectively connected, so that the combination of power equipment consisting of two generators and one transformer is obtained, the reliability and the stability of a power system are improved, the transmission capacity of the power system is increased, and the requirements of the secondary reheating technology requirement and the ultrahigh-capacity generator set are met.

Description

Coil structure, generator transformer and power generation boosting system

Technical Field

The application relates to the technical field of power transformers, in particular to the field of ultra-supercritical thermal power generation equipment, relates to a generator transformer and a coil structure thereof, and particularly relates to a two-machine-one-transformer generator transformer suitable for arrangement of ultra-supercritical secondary reheating high-low units.

Background

Protecting the ecological environment and coping with climate change is a common responsibility of all human beings. Along with the continuous rising of global environmental protection consciousness, green development is taken as development which is compliant with nature and promotes harmonious symbiosis of people and nature, is development which obtains the maximum economic and social benefits with the least resource and environment cost, is high-quality and sustainable development, and has become the consensus of various industries of various countries. The traditional power industry is one of the industries with the largest global greenhouse gas emission and the largest energy consumption, faces more urgent transformation development pressure, and the development direction of thermal power generation equipment is changed to be more efficient, environment-friendly and intelligent.

On this basis, the development of ultra-supercritical technology and secondary reheating technology has become a necessary trend, which also puts higher demands and demands on larger capacity generator transformers. Domestic generator sets have gradually evolved from 600MW to 1000MW to 1350 MW. However, the current 500kV voltage class transformer has 1230MVA of three-phase maximum capacity, and cannot meet the requirements of a generator set with higher capacity.

Disclosure of Invention

Accordingly, it is necessary to provide a coil structure, a generator transformer, and a power generation boosting system for solving the problem that the transformer cannot meet the requirements of a higher capacity generator set.

The coil structure comprises a main column, wherein a first high-voltage coil, a first low-voltage coil, a second low-voltage coil and a second high-voltage coil are sequentially arranged on the main column from inside to outside, and the capacity and the voltage level of the first low-voltage coil and the second low-voltage coil are different.

In one embodiment, the first high voltage coil and the second high voltage coil are serially connected to a wire outlet.

In one embodiment, the first low-voltage coil is provided with two first heads, and the two first heads are parallel and adjacently arranged; and/or

The second low-voltage coil is provided with two second heads which are parallel and adjacently arranged

In one embodiment, the main column is further provided with a voltage regulating coil, the voltage regulating coil comprises a first voltage regulating coil and a second voltage regulating coil, and the first voltage regulating coil and the second voltage regulating coil are relatively arranged on the same side, away from the first high voltage coil, of the second high voltage coil.

In one embodiment, the first high voltage coil is outgoing through the end portion and the second high voltage coil is outgoing through the middle portion;

the middle outgoing line position of the second high-voltage coil is between the first voltage regulating coil and the second voltage regulating coil.

In one embodiment, the first high voltage coil end is connected to the second high voltage coil tail, which is connected to the first voltage regulating coil and/or the second voltage regulating coil.

In one embodiment, the coil structure further includes a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are respectively disposed at two ends of the main column, and the first high-voltage coil, the first low-voltage coil, the second high-voltage coil and the voltage regulating coil are all abutted between the first pressing plate and the second pressing plate.

In one embodiment, the coil structure further includes a first insulating component, a second insulating component, and a third insulating component, where the first insulating component and the second insulating component are respectively disposed between the first high-voltage coil, the first low-voltage coil, the second high-voltage coil, and the voltage regulating coils, and the third insulating component is disposed between the first high-voltage coil, the first low-voltage coil, the second high-voltage coil, and the voltage regulating coils.

In one embodiment, the first high voltage coil is a continuous structure, and the second high voltage coil is an inner shielding continuous structure.

According to another aspect of the present application, there is provided a generator transformer including the coil structure described above, the generator transformer being of a single-phase structure, the single-phase core including two side posts and the main post.

According to another aspect of the application, a power generation boosting system is provided, wherein 3 power generator transformers with single-phase structures are combined into a three-phase split structure, and are respectively connected with 2 power generating sets with different output voltages and capacities. The coil structure comprises the main column, and the first high-voltage coil, the first low-voltage coil, the second low-voltage coil and the second high-voltage coil are sequentially arranged on the main column from inside to outside, wherein the capacity and the voltage level of the first low-voltage coil and the second low-voltage coil are different, and the power generator sets with different capacities and different voltage levels can be respectively connected to obtain a power equipment combination consisting of two generators and one transformer so as to improve the reliability and the stability of a power system, increase the transmission capacity of the power system and meet the requirements of a secondary reheating technology requirement and an ultrahigh-capacity power generator set.

Drawings

Fig. 1 is a schematic structural diagram of a generator transformer according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a coil structure of a generator transformer according to an embodiment of the present application.

Fig. 3 is a schematic circuit connection diagram of a generator transformer according to an embodiment of the present application.

Reference numerals:

1. a main column; 10. a first high voltage coil; 20. a first low voltage coil; 201. a first head; 21. a second low voltage coil; 211. a second head; 30. a second high voltage coil; 40. a voltage regulating winding; 41. a first voltage regulating coil; 42. a second voltage regulating coil; 50. a first platen; 51. a second pressing plate; 60. a first insulating member; 61. a second insulating assembly; 62. a third insulating assembly; 2. a side column;

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, fig. 1 shows a schematic structural diagram of a generator transformer according to an embodiment of the present application, where the generator transformer provided in an embodiment of the present application includes a main column 1 and two side columns 2, which are connected by an iron core to form a magnetic circuit. When alternating current is arranged on the main column 1, an alternating magnetic field is generated in the iron core, so that alternating current is generated in a high-voltage winding and a low-voltage winding on the main column 1, the areas of magnetic fields and turns of the high-voltage winding and the low-voltage winding are different, and different input and output voltages are realized.

Referring to fig. 2 and 3, fig. 2 shows a schematic diagram of a coil structure of a generator transformer in an embodiment of the present application, a first high-voltage coil 10, a first low-voltage coil 20, a second low-voltage coil 21 and a second high-voltage coil 30 are sequentially arranged on a main column 1 from inside to outside, and capacities and voltage levels of the first low-voltage coil 20 and the second low-voltage coil 21 are different, and can be respectively connected with generator sets with different capacities and different voltage levels, so as to obtain a power equipment combination composed of two generators and one transformer, thereby improving reliability and stability of a power system, increasing transmission capacity of the power system, and meeting requirements of secondary reheating technology requirements and ultra-high capacity generator sets.

Preferably, the power equipment is combined into a three-phase split structure and consists of three single-phase transformers, the head end of a high-voltage coil of each single-phase transformer is connected with a 500kV outgoing line, and two low-voltage coils are respectively connected with generator sets with 24kV and 20kV and different capacities. According to the conventional transformer configuration under the same generating set condition, 3 single-phase 300MVA generator transformers and 3 single-phase 240MVA generator transformers are needed, and compared with the conventional transformer configuration, the cost of the generator transformers provided by the embodiment of the application can be saved by 28.3%, the generator transformers have huge cost advantages, and meanwhile, the occupied area is smaller.

In some embodiments, the coil structure further includes a first pressing plate 50 and a second pressing plate 51, where the first pressing plate 50 and the second pressing plate 51 are respectively disposed at two ends of the main column 1, and the first high-voltage coil 10, the first low-voltage coil 20, the second low-voltage coil 21, and the second high-voltage coil 30 are all abutted between the first pressing plate 50 and the second pressing plate 51, so that the iron core and the winding can be kept in close contact, vibration is reduced, and mechanical strength and short circuit resistance of the transformer are improved.

In some embodiments, the first high-voltage coil 10 has a continuous structure, and has the characteristics of simple structure, simple winding process and strong short circuit resistance, so that the high reliability of the transformer is ensured; in some embodiments, the first high-voltage coil 10 adopts a wire outlet mode of end wire outlet, so that the manufacturing cost is low, the insulation structure is simple, and the manufacturing process is simple. The end outgoing line is usually referred to as the leading end (the end with higher voltage) of the high-voltage coil directly outgoing from the upper part of the body, and current flows in from one end, passes to the other end along the spiral winding of the coil winding, and forms a high-voltage electromagnetic field. Preferably, in some embodiments, the head end of the first high voltage coil 10 is 220kV and the tail end of the first high voltage coil 10 is 60 kV. The turns ratio of the first high voltage coil 10 is 39%.

In some embodiments, the second high-voltage coil 30 is of an inner shielding continuous structure, and because the voltage of the second high-voltage coil 30 is higher than that of other coils, the series capacitance between the wire segments needs to be increased, the inner shielding continuous structure directly winds the additional capacitance wire turns inside the continuous wire segments, and after the insulation treatment is performed on the end heads of the capacitance wire turns, the end heads of the capacitance wire turns are suspended in the wire segments, so that the capacitance wire turns do not load current, only work under the impact voltage, the purpose of improving the impact voltage distribution is achieved, and the reliability is higher. The first high-voltage coil 10 has a head end (a higher voltage end) and the second high-voltage coil 30 has a tail end (a lower voltage end) connected in series to form the high-voltage coil of the generator transformer.

In some embodiments, the second high-voltage coil 30 is divided into two parts that are vertically symmetrical, and because the second high-voltage coil 30 is located at the outermost side of the whole coil assembly, the middle wire outlet mode is adopted, so that the electric arc and discharge phenomena can be reduced, and the efficiency and the service life of the high-voltage coil can be improved. The middle outgoing line is usually that the head end (the end with higher voltage) of the high-voltage coil is fixed in the middle of the coil, and is led out through a high-voltage sleeve, and current flows in from the tail end (the end with lower voltage) and flows out from the center, so that a high-voltage electromagnetic field is formed. In some embodiments, the second high voltage coil 30 is rated at 500kV in the middle, the second high voltage coil 30 is rated at 220kV in the tail, and the first high voltage coil 10 and the second high voltage coil 30 are combined in series to have a capacity of 540MVA.

In some embodiments, the main column 1 is further provided with a first voltage regulating coil 41 and a second voltage regulating coil 42, the first voltage regulating coil 41 and the second voltage regulating coil 42 are oppositely arranged on the same side of the second high voltage coil 30 away from the first high voltage coil 10, and the first voltage regulating coil 41 is arranged close to the first pressing plate 50, and the second voltage regulating coil 42 is arranged close to the second pressing plate 51. In some embodiments, the first voltage regulating coil 41 and the second voltage regulating coil 42 together form a voltage regulating winding 40 of the generator transformer provided in an embodiment of the present application, an end portion of the first high voltage coil 10 is connected to a tail portion of the second high voltage coil 30, the tail portion of the first high voltage coil 10 is connected to the voltage regulating winding 40, and each tapping end of the voltage regulating winding 40 is connected to a corresponding position of the non-excited switch.

In some embodiments, the first voltage regulating coil 41 and the second voltage regulating coil 42 are in a double-spiral structure, two ends of the first voltage regulating coil are connected in parallel and then connected in series with the tail end of the first high voltage coil 10, each tapping end of the voltage regulating winding 40 is connected with a corresponding position of a non-excitation switch (not shown in the figure), and a neutral point sleeve is led out from the voltage regulating switch. Preferably, an outlet gap is left between the first voltage regulating coil 41 and the second voltage regulating coil 42, and the middle part of the aforementioned second high voltage coil 30 is led out through the outlet gap and led out through the high voltage bushing.

In some embodiments, the first low voltage coil 20 is provided with two parallel adjacent first taps 201 and the second low voltage coil 21 is provided with two parallel adjacent second taps 211. The currents of the two first heads 201 are equal and opposite in direction, and the currents of the two second heads 211 are equal and opposite in direction, so that the influence of the distribution of magnetic flux in the iron core is avoided as much as possible, and part of the magnetic flux cannot be closed in the iron core, so that magnetic flux leakage is generated on the pull plate and the web plate of the iron core, and the occurrence of local overheating phenomenon is further avoided. Preferably, the first low voltage coil 20 has a capacity of 240MVA and an input voltage of 20kV; the capacity of the second low voltage coil 21 was 300MVA and the input voltage was 24kV. It should be noted that, the coil capacity and the input voltage can be adjusted according to the actual requirement of the generator set, and this scheme is an embodiment.

In some embodiments, the coil structure further includes a first insulation component 60, a second insulation component 61, and a third insulation component 62, where the first insulation component 60 and the second insulation component 61 are respectively disposed at two ends of the first high voltage coil 10, the first low voltage coil 20, the second low voltage coil 21, the second high voltage coil 30, and the voltage regulating winding 40, specifically, the first insulation component 60 is disposed on a side of the first pressing plate 50 near the second pressing plate 51, and the second insulation component 61 is disposed on a side of the second pressing plate 51 near the first pressing plate 50. The third insulation member 62 is provided between the first high voltage coil 10, the first low voltage coil 20, the second low voltage coil 21, the second high voltage coil 30, and the voltage regulating winding 40.

In some embodiments, the first insulating assembly 60 and the second insulating assembly 61 each include a first insulating end ring, a second insulating end ring, and a third insulating end ring, where the first insulating end ring is disposed at two ends of the first high voltage coil 10, the second insulating end ring is disposed at two ends of the first low voltage coil 20 and the second low voltage coil 21, and the third insulating end ring is disposed at two ends of the voltage regulating winding 40, so that electromagnetic interference can be effectively reduced, and electrical safety is ensured. In some embodiments, the third insulation assembly 62 includes an insulation cardboard tube and a stay to insulate and support the coils of the transformer, preventing electrical shorts between the coils, while also improving the mechanical strength and stability of the transformer.

Some embodiments of the present application provide a coil assembly process for a generator transformer as follows:

first, the second presser 51 and the second insulating member 61 need to be placed on the core prior to assembly.

Then, the respective coils are wound individually. Specifically, the insulating cardboard tube and the inner stay are placed on the die before winding, and then the first high-voltage coil 10 is wound in a vertical winding mode. After the first high-voltage coil 10 is wound, the insulating paperboard cylinder and the inner stay are placed on a die, then the first low-voltage coil 20 and the second low-voltage coil 21 are wound, the first low-voltage coil 20 and the second low-voltage coil 21 are wound in a horizontal winding mode, the inner layer coil is wound firstly, the height of the coil is controlled after the inner layer is wound, the outer layer coil is wound again, the winding direction of the outer layer is opposite, and the height of the outer layer coil is adjusted to be consistent with that of the inner layer after the winding is completed. After the first low-voltage coil 20 and the second low-voltage coil 21 are wound, an insulating paperboard cylinder and an inner stay are also placed on the die, and the second high-voltage coil 30 has a structure in the middle, so that the lower half section is required to be wound first, the upper half section is required to be wound later, and the upper part and the lower part are symmetrically wound. The voltage regulating winding 40 is also wound horizontally, and after the insulating cardboard tube and the inner stay are placed on the mold, the second voltage regulating coil 42 is wound first, and then the first voltage regulating coil 41 is wound. In the process of winding the coil, the first insulating member 60 and the second insulating member 61 are disposed at both ends of the coil every time one coil is wound.

Finally, the values of the inner diameter and the outer diameter and the height of each coil are controlled to the required values, and then each coil is assembled in sequence. In particular, after the second high voltage coil 30 is assembled, a third insulation member 62 is placed between the first voltage regulating coil 41 and the second voltage regulating coil 42. After the coil is assembled, the first insulation assembly 60 and the first pressing plate 50 are placed.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.

Claims (10)

1. The utility model provides a coil structure, its characterized in that, coil structure includes the principal post, from inside to outside arranged first high-voltage coil, first low-voltage coil, second high-voltage coil in proper order on the principal post, first low-voltage coil with the capacity and the voltage class of second low-voltage coil are all inequality.

2. The coil structure of claim 1, wherein the first high voltage coil and the second high voltage coil are serially connected to be outgoing.

3. The coil structure according to claim 1, wherein the first low-voltage coil is provided with two first heads, the two first heads being arranged in parallel and adjacent; and/or

The second low-voltage coil is provided with two second heads, and the two second heads are parallel and adjacently arranged.

4. The coil structure of claim 1, wherein the main column is further provided with a voltage regulating coil, the voltage regulating coil comprises a first voltage regulating coil and a second voltage regulating coil, and the first voltage regulating coil and the second voltage regulating coil are relatively arranged on the same side, away from the first high voltage coil, of the second high voltage coil.

5. The coil structure of claim 4 wherein the first high voltage coil is routed through an end and the second high voltage coil is routed through a middle;

the middle outgoing line position of the second high-voltage coil is between the first voltage regulating coil and the second voltage regulating coil.

6. The coil structure of claim 4, wherein the first high voltage coil end is connected to the second high voltage coil tail, the first high voltage coil tail being connected to the first voltage regulating coil and/or the second voltage regulating coil.

7. The coil structure of claim 4, further comprising a first platen and a second platen, wherein the first platen and the second platen are disposed at two ends of the main column, respectively, and the first high voltage coil, the first low voltage coil, the second high voltage coil, and the voltage regulating coil are all abutted between the first platen and the second platen.

8. The coil structure of claim 7, further comprising a first insulation assembly, a second insulation assembly, and a third insulation assembly, wherein the first insulation assembly and the second insulation assembly are disposed at two ends of the first high voltage coil, the first low voltage coil, the second high voltage coil, and the voltage regulation coil, respectively, and the third insulation assembly is disposed between the first high voltage coil, the first low voltage coil, the second high voltage coil, and the voltage regulation coil.

9. A generator transformer comprising a coil structure according to any one of claims 1-8, said generator transformer being of single-phase construction, a single-phase core comprising two side legs and said main leg.

10. A power generation boosting system, characterized by comprising the power generator transformer of claim 9, wherein 3 power generator transformers with single-phase structures are combined into a three-phase split structure, and are respectively connected with 2 power generator sets with different output voltages and capacities.